Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b9bbd7cd4eeed7…

MALICIOUS

PDF

80.7 KB Created: 2021-04-23 23:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16f704fb77c63d691c1266163bb29e11 SHA-1: ae9ea0ece4b060a3b6ef9257b3d25d0c3219ac4d SHA-256: 68b9bbd7cd4eeed7d4f2721a24419a13ada94ca8d45c2f5c05b932b17fc4554c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for a link farm, suggesting it's designed to host numerous external links. The primary external URI, 'https://xezojetit.ru/strik?utm_term=arris+sbg6580+admin+password', indicates a lure related to router credentials. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/strik?utm_term=arris+sbg6580+admin+password
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/9400030.pdf
    • https://cdn-cms.f-static.net/uploads/4473432/normal_605f9f608ee28.pdf
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/6407948.pdf
    • http://nibofope.66ghz.com/33044575071.pdf
    • https://cdn-cms.f-static.net/uploads/4481852/normal_5fd34fcf5188c.pdf
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5ff4727a22a02.pdf
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/6642e.pdf
    • https://cdn-cms.f-static.net/uploads/4496811/normal_6019379228141.pdf
    • https://ripegedabezigiz.weebly.com/uploads/1/3/2/6/132695689/disudikinurogu_bolukogedo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_664f1cb7359b40cc9e382aad5a11f2fc.pdf?index=true
    • https://s3.amazonaws.com/bojafazes/651572671.pdf
    • https://s3.amazonaws.com/kezemiradigu/hangout_free_for_android_mobile.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/52142782418.pdf
    • https://s3.amazonaws.com/sajatesawodiji/what_is_the_syllabus_of_class_9th.pdf
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_ad1a9a6fde1543279424a119ead9efd0.pdf?index=true
    • https://s3.amazonaws.com/najubu/how_much_oil_does_a_champion_generator_take.pdf
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_bedba433a39a4e889568e2c5e2454678.pdf?index=true
    • https://s3.amazonaws.com/wegugus/munchkin_precision_digital_bottle_warmer_instructions.pdf
    • https://s3.amazonaws.com/gixawetopoli/iphone_camera_vs_android_meme.pdf
    • https://s3.amazonaws.com/kofabube/mathematics_paper_1_non_calculator_2017_answers.pdf
    • https://s3.amazonaws.com/jobavo/old_school_tobias_wolff_online_book.pdf
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_936aeacdc4b6401eb5cdec41aeac23c8.pdf?index=true
    • http://bepibuxel.epizy.com/asme_sec_viii_div_3.pdf
    • https://s3.amazonaws.com/bisegilupuf/54525067923.pdf
    • http://sonevusejebazu.epizy.com/91599379270.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8cc.bin
a22c11abf6df37b84153a2963eb16ed8307dd95586075f8f81ed3966c06a38ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 6080 bytes
font_01_sfnt_off00010d70.bin
074509b098bdf60150431414043e0bf7ac4982a72e289d7180636ccaa0863830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 11192 bytes

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